These are all the instructions you need. If you can squeeze an empty beer can with one hand you'll have the strength to install. Took me longer to find a towel than it did to replace the spring.
The force to push the pedal is the same. To me the Steeda spring (or no spring) takes away that weird spot in the middle of the pedal throw where the clutch starts to grab. Makes it easier to modulate and not look like a noob when pulling up your driveway.